Colorado State University 
Department of Atmospheric Science

PARTICLE SIZE DISTRIBUTION OBSERVATIONS AT MACQUARIE ISLAND

F. Brechtel and S. Kreidenweis
Dept. of Atmospheric Science
Colorado State University
Fort Collins, CO 80521
USA

GENERAL REMARKS

During the ACE-1 intensive measurement campaign the Aerosol Chemistry group
in the Dept. of Atmospheric Science at Colorado State University (CSU) carried
out continuous particle size distribution measurements at Macquarie Island,
Tasmania. The measurements were performed between November 22 and December
13, 1995.

A differential mobility particle sizing (DMPS) system was employed to conduct
the measurements. The DMPS system consisted of a TSI Model #3071 differential
mobility analyzer (DMA) and a TSI Model #3010 condensation particle counter (CPC). The
CPC was calibrated at the ACE-1 CPC calibration workshop at the University of
Washington. Size distributions were obtained between 18 and 540 nm. The measured
raw distributions were inverted using a new data inversion algorithm developed
at the Institute for Tropospheric Research in Leipzig, Germany. During the
inversion the DMA transmission efficiencies and the CPC counting efficiencies
were accounted for. Size distribution have been corrected for diffusional
losses within the sample inlet tubing and the permeable membrane dryer used
to reduce the sample humidity to levels below 25% prior to entering the
DMA.

FILE FORMAT AND STRUCTURE

The inverted size distribution data are stored in a single file containing
1525 size distributions with the following format:

First row includes the midpoint diameter array to be used with the inverted size
distribution (dN/dlogDp) data. Diameter units are nanometers and there are 53
diameter channels. The diameter values are spaced at logarithmically equal intervals.

Second through last rows include the inverted 53 channel size distribution data.

Each row contains the following information:

	First Column:		Decimal Day of Year (UTC)
	Second Column:		Instrument Temperature (K)
	Third Column:		Instrument Pressure (mb)
	Fourth Column:		Number of Size bins (always 53)
	Fifth-57th Column:	dN/dlogDp (or diameters for row one)

The data were written to file using the following fortran statement:

	format='(f8.4,2x,f7.3,2x,f7.2,2x,i2,2x,53(e10.4,2x))'

Please contact the principal investigator (Dr. Sonia Kreidenweis) prior to using
this dataset. Questions may be addressed to:

	Fred Brechtel			or		Sonia Kreidenweis
	Phone: 970-491-8401				Phone: 970-491-8350